A distant kinsman of the 6th duke of Devonshire, Waterpark was descended from Henry Cavendish (1550-1616), of Tutbury, Staffordshire, the elder brother of the 1st earl of Devonshire. On the death of his mother in 1608 Henry had inherited Chatsworth, which he sold the following year to his brother. He had no legitimate children, but his bastard son Henry Cavendish of Doveridge was grandfather of the Henry Cavendish who accompanied the 3rd duke of Devonshire to Ireland when he was appointed lord lieutenant in 1737. This Henry became teller of the Irish exchequer and married a daughter of Henry Pyne of Waterpark, Cork. He was made a baronet in 1755 and was succeeded in 1776 by his only son Henry, the parliamentary reporter, whose wife Sarah, daughter and heiress of Richard Bradshaw of Cork, was created Baroness Waterpark in 1792 in recognition of his political services, with remainder to her male heirs. Her eldest son Richard, this Member’s father, became the 2nd baron on her death in 1807, having succeeded his father as 3rd baronet in 1804.
Waterpark’s ancestors had maintained good relations with the Devonshires, their neighbours, and held a prominent position in Derbyshire in consequence. The 5th duke proposed Waterpark’s father for membership of Brooks’s in 1809. When the 6th duke offered Henry Brougham a seat for his pocket borough of Knaresborough in January 1830, he informed him that his second choice was Waterpark, ‘a person closely connected with me whom I should in that case bring in’.
One word about myself. I have made a determination never to spend money on an election, nor would I ever advise a friend to do so ... So long as the duke brings me in free of expense I shall be happy to continue in Parliament, but so fond as I am of the county I think I made a sufficient sacrifice in living so many months in London without spending money to bring myself in, therefore my parliamentary career depends on others.
Derbys. RO, Vernon mss, Waterpark to Vernon [Mar. 1831].
At the ensuing general election he offered again for Knaresborough as a supporter of ‘all the bill’, but before travelling to Yorkshire called on George Vernon to persuade him to stand on Devonshire’s interest. Rumours of another opposition at Knaresborough came to nothing and he was returned unopposed. At the declaration he reported Devonshire’s willingness to relinquish his burgage interest in the borough under the terms of the reform bill.
Waterpark voted for the second reading of the reintroduced reform bill, 6 July, at least twice against adjournment, 12 July, and gave general support to its details, often as a pair, though he was in the minority against the division of counties, 11 Aug., and divided for the enfranchisement of £50 tenants-at-will, 18 Aug. 1831. He voted against the Irish union of parishes bill, 19 Aug. The projected division of Derbyshire created difficulties for Devonshire. He proposed to return Waterpark for the Southern division, over which he would have the greater control, but this meant displacing Vernon, whom he asked to try the Northern division. Vernon made his case to be returned for the south in a letter to Devonshire, 22 Aug., but on 3 Sept. Waterpark expressed his belief that the Chandos clause had ‘weakened [Vernon] very much and strengthened me’.
At the 1832 general election he was returned with Devonshire’s support for the Southern division of Derbyshire and benefited from a liberal subscription, which had been raised to assist him on account of his ‘limited fortune’.
